Ercles vein
noun
Er·cles vein
ˈərˌklēz-
: a rousing somewhat bombastic manner of public speaking or writing
could not write in the Ercles vein if he would, and he had chosen to give his inaugural address an agreeably quiet tone 
Nation
Nation
Word History
Etymology
Ercles, alteration of Hercules, ancient Greco-Roman hero, from Latin, from Greek Hēraklēs